How secure are apps that using RPC portmapping?
In general the golden rule for the security consists in activating fewer services possible and only when necessary.
Perhaps I will try an application (this is a file manager) that seems to apply to use this service, such dangers arise in safety?

For more detailed information, excluding any outgoing/incoming UDP/TCP connections.$fstat | grep internet | grep -v -e '>' -e '<'
It could probably be done in a cleaner fashion, but at least with this, you can determine some additional information about the process that opened the port.